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RSpec.describe Magick::Image, "#clut_channel" do
it "works" do
image = described_class.new(20, 20) { |options| options.colorspace = Magick::GRAYColorspace }
clut = described_class.new(20, 1) { |options| options.background_color = 'red' }
result = image.clut_channel(clut)
expect(result).to be(image)
expect { image.clut_channel(clut, Magick::RedChannel) }.not_to raise_error
expect { image.clut_channel(clut, Magick::RedChannel, Magick::BlueChannel) }.not_to raise_error
expect { image.clut_channel }.to raise_error(ArgumentError)
expect { image.clut_channel(clut, 1, Magick::RedChannel) }.to raise_error(ArgumentError)
end
it 'accepts an ImageList argument' do
image = described_class.new(20, 20) { |options| options.colorspace = Magick::GRAYColorspace }
image_list = Magick::ImageList.new
image_list.new_image(10, 10)
result = image.clut_channel(image_list)
expect(result).to be(image)
end
end
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